Optical Print Head Reference Voltage Stabilization
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Solution Overview
Problem
Existing optical print heads with multiple power feeding points still experience uneven light emission due to potential drops on power lines between adjacent points, leading to inconsistencies in light output from organic light-emitting diodes (OLEDs).
Innovation Solution
An optical print head design featuring OLEDs connected to current supply lines branching from a first power line, with holding elements and driving drivers controlling current based on stored voltages, using a separate power line for reference voltage to stabilize light emission, ensuring uniformity across all OLEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple power feeding points are provided on the substrate, then the wiring distance is shortened and potential drop is reduced, but unevenness in light emission amount still occurs due to potential drop between adjacent power feeding points
Solution Approach 1:
A moisture-proof plate is introduced as an intermediary component carrying auxiliary power lines. These auxiliary power lines connect to the substrate's power lines at multiple points, serving as a mediator to distribute power more evenly across the substrate and reduce potential drops between adjacent power feeding points.
Solution Approach 2:
The power distribution system is extended from a two-dimensional substrate plane to a three-dimensional structure by adding a moisture-proof plate as a separate layer. This allows auxiliary power lines to be routed on the moisture-proof plate and connect at multiple points, creating additional power feeding pathways that reduce potential drops.
2Measurement precision
If auxiliary power lines are added on the moisture-proof plate, then the number of power feeding points increases, but the circuit configuration becomes more complex
Solution Approach 1:
The moisture-proof plate serves multiple functions: it provides mechanical support for the OLED elements, acts as a barrier against moisture and contaminants, and simultaneously carries auxiliary power lines for improved power distribution. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The auxiliary power lines are integrated with the existing power distribution system by connecting them to the substrate's power lines at multiple points. This merging of power distribution pathways allows the system to benefit from additional power feeding points without requiring completely separate wiring systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses unevenness in light emission by stabilizing the voltage supply to each OLED, reducing potential drops and ensuring consistent light output across the print head.
Implementation Method 1
a line head including a large number of organic EL elements as light-emitting elements
Data Source
Figure 1
Figure 2~4
Figure 5
AI summary
Optical print head includes: light-emitting elements connected one-to-one to current supply lines branching from first power line at different positions in longitudinal direction; holding elements; signal writing unit writing luminance signal into each holding element, the luminance signal being represented by voltage indicating light emission amount of corresponding light-emitting element; second power line supplying reference voltage to each holding element, the reference voltage being reference when signal writing unit writes luminance signal into holding element; and driving drivers corresponding one-to-one with current supply lines and controlling current supplied to corresponding current supply line from first power line, in accordance with voltage held in corresponding holding element when signal writing unit has written luminance signal into corresponding holding element, wherein power source supplying the reference voltage to second power line is common with power source supplying voltage to signal output subunit outputting luminance signal.